Inner parting agents for producing self-parting moldings made of polyisocyanate polyaddition products

Abstract

In a process for producing self-releasing, compact or cellular moldings which comprise polyisocyanate polyaddition products and may contain reinforcing material by reacting a) organic and/or modified organic polyisocyanates with b) at least one compound containing at least two reactive hydrogen atoms and having a molecular weight of from 62 to 10,000 and, if desired, c) chain extenders and/or crosslinkers in the presence of d) internal mold release agents and in the presence of or absence of e) catalysts, f) blowing agents, g) reinforcing materials and h) auxiliaries in an open or closed mold, the internal mold release agents (d) used are diesters and/or monoesters of alkylsuccinic acids and/or diesters and/or monoesters of alkenylsuccinic acids.

We claim:  
     
       1. A process for producing self-releasing, compact or cellular moldings comprising reacting 
       a) organic and/or modified organic polyisocyanates with  
       b) at least one compound containing at least two reactive hydrogen atoms and having a molecular weight of from 62 to 10,000 and, optionally,  
       c) chain extenders and/or crosslinkers in the presence of  
       d) internal mold release agents and in the presence or absence of  
       e) catalysts,  
       f) blowing agents,  
       g) reinforcing materials and  
       h) auxiliaries  
       in an open or closed mold, wherein the internal mold release agents (d) comprise diesters and/or monoesters of alkylsuccinic acids and/or diesters and/or monoesters of alkenylsuccinic acids. 
     
     
       2. A process as claimed in claim  1 , wherein the alkyl or alkenyl groups of the alkylsuccinic or alkenylsuccinic diesters or monoesters have a mean molecular weight (number average) M n  of from 250 to 3000. 
     
     
       3. A process as claimed in claim  2 , wherein the alkyl groups of the alkylsuccinic or alkenylsuccinic acids or monesters/diesters are linear or branched and comprise polyisopropylene or polyisobutylene radicals and the alkenyl groups comprise polyethenyl, polyisopropenyl or polyisobutenyl radicals. 
     
     
       4. A process as claimed in claim  3 , wherein the alkyl groups comprise oligomers of propene and/or at least one branched 1-olefin having from 4 to 10 carbon atoms and contain at least 3 olefin units and have a mean molecular weight (M w ) of from 300 to 3000 g/mol. 
     
     
       5. A process as claimed in claim  1 , wherein the alkylsuccinic and/or alkenylsuccinic acids is prepared by polymerization of 
       a) from 20 to 60 mol % of maleic acid or its anhydride,  
       b) from 10 to 70 mol % of at least one oligomer of propene or a branched 1-olefin having from 4 to 10 carbon atoms, having a mean molecular weight M of from 300 to 5000, and  
       c) from 1 to 50 mol % of at least one monoethylenically unsaturated compound which can be copolymerized with the monomers a) and b).  
     
     
       6. A process as claimed in claim  5 , wherein the monomer c) is selected from the group consisting of 
       monoethylenically unsaturated C 3 -C 10 -monocarboxylic acids;  
       linear 1-olefins having from 2 to 40 carbon atoms; and  
       vinyl and alkyl allyl ethers having from 1 to 40 carbon atoms in the alkyl radical.  
     
     
       7. A process as claimed in claim  1 , wherein the alkylsuccinic or alkenylsuccinic diesters or monoesters are prepared by reacting alkylsuccinic acid or derivatives or alkenylsuccinic acid or derivatives with primary and/or secondary organic monoalcohols and/or polyalcohols. 
     
     
       8. A process as claimed in any of claim  1 , wherein the alkylsuccinic or alkenylsuccinic diesters or monoesters are prepared by reacting alkylsuccinic or alkenylsuccinic anhydride with aliphatic monools and/or polyols. 
     
     
       9. A process as claimed in any of claim  1 , wherein the alkylsuccinic or alkenylsuccinic diesters and/or monoesters are prepared by reacting alkylsuccinic and/or alkenylsuccinic acid and/or derivatives with monools or polyols selected from the group (A) consisting of 
       a) alkanols having up to 40 carbon atoms;  
       b) polyether polyols;  
       c) polyester polyols;  
       d) hydroxyl-containing natural materials;  
       e) esters of at least trifunctional alcohols and fatty acids, in which esters at least one hydroxyl group is free; and  
       f) aminoalcohols and/or polyols containing only tertiary amino groups.  
     
     
       10. A process as claimed in any of claim  1 , wherein the alkylsuccinic diesters or monoesters, alkenylsuccinic diesters or monoesters or mixtures of at least two of the diesters or monoesters or mixtures of diesters and monoesters are used in an amount of from 0.2 to 15 parts by weight per 100 parts by weight of the component (b). 
     
     
       11. A process as claimed in any of claim  1 , wherein the chain extenders or crosslinkers have a molecular weight of less than 500. 
     
     
       12. A process as claimed in claim  1 , wherein the internal mold release agents comprise the reaction products of polyisobutylenesuccinic anhydride and/or polyisobutylenesuccinic anhydride and/or copolymers with an alcohol (A). 
     
     
       13. A process as claimed in claim  1 , wherein the internal mold release agents comprise the reaction products of polyisobutylenesuccinic anhydride and/or copolymers with a combination of an alcohol (A) and an amine (B). 
     
     
       14. A process as claimed in claim  1 , wherein the alkylsuccinic and/or alkenylsuccinic diesters and/or monoesters are treated with boron oxide, hydrated boron oxide, boric acid, boric esters, sulfur, phosphorus oxides, epoxides, episulfides, amines and/or alkaline earth metal salts. 
     
     
       15. A process as claimed in claim  1 , wherein the reinforcing materials g) comprise fibers or lay-ups, woven fabrics, mats, felts or nonwovens based on glass, carbon, metal, polymer and/or natural fibers.